Thermal paste and thermal pads help transfer heat between a chip and its heatsink. They don’t cool a computer by themselves: they reduce microscopic gaps between two surfaces that must contact.
Thermal paste
Thermal paste is applied in a thin layer between the processor or GPU and the heatsink. It’s suitable for many assembly and maintenance operations. The amount must be controlled: too little can leave uncovered areas, while too much complicates cleaning.
The procedure depends on the device. Some laptops are difficult to disassemble and may require tools or special precautions.
Phase-change thermal pad
A phase-change thermal pad is a pre-cut or cuttable material that changes with heat. It can be practical when space, mounting pressure and the surface to cover are defined. Choose the correct thickness and avoid bending or contaminating it.
Don’t interchange them automatically
Paste and pads do not meet the same constraints. A pad should not replace a thermal component designed for a precise height without verifying thickness. Conversely, filling a pad-designated gap with paste can create poor mechanical contact.
Before any intervention, note component positions, photograph the assembly and consult the manufacturer’s documentation. Unplug the device, work on a clean surface and avoid static electricity.
Commerce Meritium offers thermal paste advertised for CPU/GPU use and a Honeywell PTM7950 thermal pad for certain cooling applications. Conductivity numbers on a product page aren’t enough to determine compatibility: thickness, pressure and format are just as important.
Takeaway: The best material is the one that matches the device’s geometry and procedure, not necessarily the one with the highest number.